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Electronic Lock Circuits
Electronic Locks:  #'s - A     B - Z

Last Updated: October 24, 2017 02:54 PM


Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

Automatic Room-Lock & Lights Circuit     -  This circuit counts and indicates up to nine persons present in the room and automatically locks the door and switches off lights as soon as they leave.  It automatically switches on...___ Electronics Projects for You

Combination Lock       -  Schematic Only __ Designed by Jon Fick

Combination Lock       -  a digital lock with keypadenter the correct code to operate a solenoid.  Based around ua3731 __ Contact: P. Townshend EduTek Ltd

Combination Lock2     -  a digital lock with switches.  A nifty circuit i'm chuffed with, based around just 2 logic ics! __ Contact: P. Townshend EduTek Ltd

Digital combination lock using paIR of CD4 013 CMOS chips      -  The Circuit Board is Designed to accept 2 types of Drive transistors.  I Used a 2N3906 in this schematic, but for Higher Current Drive for a Solenoid, You can use Various T0-220 PNP types of transistors.  USE ONLY ONE OR THE OTHER, NOT BOTH.  In the Picture, I just put a Resistor and LED, where the Solenoid should go.   __ Designed by G.L. Chemelec

Digital Keypad Combination Lock         -  This simple circuit is the electronic version of the combination lock.  Using the special purpose LS7220 digital lock IC, the circuit allows a 4 digit combination of your choice to activate a relay for a set period of time.  This relay can then be __ Designed by Aaron Cake

Digital Lock     -  The Circuit Board is designed to accept 2 types of Drive transistors.  I Used a 2N3906 in this schematic, but for Higher Current Drive for a Solenoid, You can use Various T0-220 PNP types of transistors.  USE ONLY ONE OR THE OTHER, NOT BOTH.  In the Picture, I just put a Resistor and LED, where the Solenoid should go.   __ Designed by G.L. Chemelec

Electronic Bicycle Lock    -  The electronic bicycle lock described here is a worthwhile alternative for bicycle owners who want to make their bicycles 'intelligent' at reasonable cost.  One of the benefits of building it yourself...___ Electronics Projects for You

Electronic Card Lock for Appliances     -  The circuit presented here can be used as a lock for important electronic and electrical appliances.  When a card is inserted inside its mechanism, depending upon the positions of the holes...___ Electronics Projects for You

Electronic Door Lock  -  Home burglary incidents are on the rise. Homes without proper security measures in place are particularly more vulnerable. But, it is easy to avoid home break-ins by using a simple solution...___ Electronics Projects for You

Electronic key    -  This electronic circuit turns on a relay by pressing four keys in the correct order.  The circuit works by a CD4017 and a combination of logic gates. 
At the start condition the CD4017 turns on the first output, which is connected to the first gate of the CD4081.  By pressing the correct key (P1) both inputs of that gate take the high level.   __ Designed by Andrea-Central Italy

Electronic safety lock based on ATtiny26          -  This safety-lock can be work with up to 8 different  telecards (empty  or not) as access keys.  Each  telecard can be registered or  unregistered from the  system, by press the  corresponding button.   __ Designed by © Vassilis Serasidis

Rolling Code Security System; Pt 1       -  Ideal for keyless entry for doors in cars, homes & industry, this Keyless Entry System features a rolling code to ensure high security.  It also has two door-strike outputs, an alarm system & provision to use up to 16 separate keyfob transmitters with the same receiver.___ SiliconChip

Rolling Code Security System; Pt.2      -  Last month, we described the circuitry and gave the PC board assembly details for our new Rolling Code Keyless Entry System.  This month, we cover the installation and setting-up procedures and describe the optional SOIC adaptor board, so that you can program the PIC micro out of circuit.___ SiliconChip

Secured Room Access SystE - M    -  Security is a prime concern in our day-to-day life.  And access control system forms a vital link in a security chain.  The microcontroller-based digital lock presented here is an access control system...___ Electronics Projects for You

Sensor-Based Door Lock          -  The door lock controller given here is a simple electronic switching circuit realised using a low-cost unipolar Hall effect sensor IC MH183.  This CMOS switch IC incorporates advanced chopper stabilisation technology...___ Electronics Projects for You

Simple  Key-Operated Gate Locking SystE - M   -  This simple key-operated gate locking system allows only those persons who know the preset code to open the gate.  The code is to be entered from the keypad within the preset...___ Electronics Projects for You

Telecard as Safety-Lock Key   -  This safety-lock can be work with up to 8 different  telecards (empty  or not) as access keys.  Each  telecard can be registered or  unregistered from the  system, by press the  corresponding button.   __ Designed by © Vassilis Serasidis

Transistorised Code Lock With Torch  -  This electronic lock for domestic use opens only when you connect the right combination of five switches.  There are twelve switches in total.  If you connect a wrong combination, the lock remains closed.  At night, flip switch S3 to ‘on’ position in order to enable the torch.  In the daytime, flip it back to ‘off’ __

1-button lock provides high security   -  03/04/99 EDN-Design Ideas    (contains several designs, scroll to find this one)   Figure 1 is the block diagram of an easily programmed, single-button combination lock.  You operate the lock by using a series of short and long pulses from a momentary switch that masquerades as a doorbell button.  The circuit uses inexpensive CMOS logic.  The retriggerable timer, T1, locks out entries made after the T1 code-entry window, thereby greatly enhancing security.  The circuit in Figure 2 operates as follows: The Schmitt-trigger quad NAND gate, IC1, debounces the code-entry switch and, with the aid of simple analog circuitry, produces separate outputs for activation times of less than and more than 0.3 sec.  These outputs connect to the select gate, IC5__ Circuit Design by Maxwell Strange, Fulton, MD

5 Digit Alarm KeypA - D -  This is an enhanced 5 digit keypad which may be used with the Modular Alarm System.  This switch will suit the Modular Burglar Alarm circuit.  However, it also has other applications.  The Keypad must be the kind with a common terminal and a separate connection for each key.  On a 12-key pad, look for 13 terminals.  The matrix type with 7 terminals will NOT do.  Choose the five keys __ Designed by Andy Collison

Automatic Door Opener with PIC12c508           -  This circuit can be used to operate an electric strike or an electromagnetic lock on a door.  It is not the door being opened/closed, but a small electromagnetic strike which unlocks the door.  The opener has the following features currently programmed in software __ Designed by Peter Jakab


Electronic Locks:  #'s - A     B - Z

 


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